Reasons for differences between proofing and manuscript

Reasons for differences between proofing and manuscript

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1 The transmission original is different from the reflective print. Transmission originals are viewed using transmitted light, while prints are viewed using reflected light. Viewing light sources differ in their quality.

2 The dye color is different from the pigment color. The transmission manuscript is a dye color, and the printed matter is a pigment (ink) coloration. There is a difference in coloration between the two, so the quality effect is completely different.

3 The respective density ranges are different. Transmissive manuscripts generally have a high density, and their density contrast is also large. However, printed matter is limited by the ability to bind ink and paper. The density is low, and the density contrast is also small. Therefore, there is a large gap in the performance density range. Even in the case of prints that reflect the original copy, there is a gap in the density range.

4 Consecutive tone levels and screening levels are different. The transmission manuscript is a continuous layer, which is composed of layers of fine dye particles, and the printed matter is composed of printed dots. There is a certain gap between the two in terms of tone adjustment.

5 Transparent and reflective visual effects are different. Observing transmissive originals under natural light and artificial light sources has a very different effect, so observing originals and printed samples are ideal under fluorescent lamps with a color temperature of 5000K and a color rendering index of 92 or higher under standard light sources. The color rendering effect is also different depending on the lighting environment.

The above five points are the basic reason why the copy cannot completely restore the original.